Virus test!? Shoot, if that sucker even looks at me wrong I'm trashing him!! :crazy:
Well, that's fine for you, but for me I'd rather check it out. I still remember a posting a few years back from someone who tested something like a dozen of her plants as an experiment, half of which she was worried might have virus from some symptoms and half which did not. Several of the ones she had had no symptoms from and were what she thought of as the control group tested positive. IIRC, only one of the ones with the symptoms tested positive. While there are viruses which are not measured by these strips, there are also other things which can cause virus-like symptoms, such as fungus, stress, chemical exposure, temperature extremes, genetic issues, etc.
So it still comes down to a judgment call. And remember there are some folks who have what are now very rare, fine old plants in their collections known to be virused but keep them anyway for their beauty, theoretically isolated from other plants (won't get into the insect vector issue here). The virused plants have remained healthy for 40-50+ years - they just are virused but not fatally.
At this point it's not a B/W issue; I'm hoping that better testing of a wider variety of viruses will become available inexpensively but who knows? There will probably still be other viruses not tested for.
If I have a plant I suspect of virus, I test it and isolate it. If it tests negative (and all but two have - one trichopilia and one phal) I put it off to the side and watch it through a couple more growth/bloom cycles and if I see no further evidence, I don't worry about it anymore.
As they say, it's the quiet ones ya gotta watch out for - the apparently symptomless plants which may be carrying virus and spreading it without themselves showing signs until much, much later when it's already too late!